Sizing composition and process of making same.



waxed as desired at rosin .in the size.

UNITED STATES PATENT. OFFICE.

JUDSON A. DE GEW, OF HONTBEAL QUEBEC, CANADA.

SIZING COMPOSITION AND 'PROGESS OF MAKING SAME.

No Drawing.

To all whom it may concern:

Be it known that I JUnsoN A. DE Cnw,a citizen of the Dominion of Canada,residing at the city of Montreahin the Province of Quebec and Dominionof Canada, have invented certain new and useful Improvements in SizingCompositions and'Processes of Making Same, of which the following is afull, clear, and exact description.

This invention relates to a sizing composition, particularly adapted.for use in the manufacture of paper.

The main object of the invention is to provide a sizing composition withwhich the paper stock can be treated while in the beating or mixingengine, thereby produc-' ing a more waterproof paper than is obtained bythe ordinary methods of manufacture.

A further object is to provide a sizing composition of such anon-separating character that paper may be waxed or semi;

operation.

A still further object is to provide a siz- .ing composition which willbe comparawith rosin soap containing unsaponified rosin, the sizingeffect is largely obtained by the melting or fusing of the rosin whilein the web of paper, by the heat of'the drying cylinders. In ordinarypractice, however, this result is sometimes not attained on account ofthe fact-that the temperature of the driers is insuflicient to meltthefree To. overcome this difli culty, I have added to the free rosin soapa certain quantity of wax, which will combine with the free rosin andbecome substantially permanently incorporated intothe soap. It isdifiicult to emulsify the rosin soap of this character, and propertemperature control is necessary, so that the dilute solutions will nothave a temperature in excess of the Specification of Letters Patent.

Application filed August 13,

the time of the sizing Patented Mar. '7, 1916.

1914. Serial No. 856,618.

melting point of the rosin wax composition.v

The amount, of wax incorporated into the I'OSlIl soap will of coursevary according to the purpose for which it is required, and thecharacter of the paper being made. When it is only desired to produceefiicient sizing results, the amount of wax will be approximately inexcess of 15% of the weight of the. rosin used, but when it is desiredto produce a special waxed or semi-waxed paper, the wax may be used inproportions up to 50% of the weight of rosin.

My method ofcarrying out the process is toadd to the free rosin soap thequantity of waxed desired, and then to emulsify same by means of aprocess for producing size solutions, such as that described in U. S.Patent,.Reissue;No. 12,549. This size solution is mixed with the paperstock while in the heating or mixing engine, and

thus a waxed or semi-waxed paper may be produced without putting thestock through the ordinary steps of a waxing process. With this product,I am able to size paper more efliciently than with a rosin soap alone,and by the use of an amount of wax up to the maximum that can beemulsified, various papers can be produced intermediate -in characterbetween a waxed paper and a rosin sized paper. This class of paper willbe found just as suitable for waterproof bottles, cups, and other waxedpaper injured during the calendering operation on account of thebrittleness of the rosin, whereas this sizing composition is morepliable and adjusts itself to the molding of the calenders. I also findthat the presence of wax in the size composition makes it less reactiveto the injurious effects of chemical residues and gives a more colloidalprecipitate with alum or other precipitating agent.

Having thus described my inventionwhat I claim is v v 1. Anon-separating composition consistmg of permanently emulsified I'OSIIIand wax in which the wax is in excess of 15% of the weight of the rosin.

sists in permanently emulsifying wax and rosin when the wax is in excessof 13% of the weight of the rosin, for the treatment of paper stock inthe heating engine.

In witness whereof, I have hereunto set my hand. in the presence of twowitnesses.

JUDSON A. DE CElV. Vitnesses S. R. \V. ALLEN, G. M. Molten-m1).

